Delete an Object - Kotlin SDK

To delete an object from a realm:

1. Open a write transaction with realm.write() or realm.writeBlocking().
2. Query the transaction's mutable realm for the object you want to delete with realm.query(). Specify the object type as a type parameter passed to query(). Filter the set of returned objects by specifying a query. To ensure your query returns the correct object, filter with unique identifying information such as a primary key value.
3. Delete the set of RealmResults returned by the query with realmResults.delete().

realm.write {
    // fetch the frog by primary key value, passed in as argument number 0
    val frog: Frog? =
        this.query<Frog>("_id == $0", PRIMARY_KEY_VALUE).first().find()
    // call delete on the results of a query to delete the object permanently
    frog?.also { delete(it) }
}